I find it funny that most people claim that it will come back stronger, yet if we asked each of you if you sold into the crash, most would answer with a yes.
It's not a bad thing to sell if you're getting close to your entry point. By no means should you allow yourself to be on the loss, but never sell for less! So many people buy during bear market and panic sell when it keeps going down. This is a very bad idea and I can assure you that you will regret it.

The article isn't saying anything new. The market always works in waves, you just can't predict when the waves will start and how high they will take you. Another bull market could begin next month, or in 3 years. It's possible that it will reach another all time high, or that it will only take us to 10k USD.